BottomNavigation.setVisibility不起作用

Question

我创建了一个应用程序并在其中使用BottomNavigationView，其中一个片段通过适配器调用另一个片段。当调用这个片段时，我试图使BottomNavigationView消失，为此我使用了setVisibility((。但问题是它并没有消失，也许有人可以告诉我做错了什么

底部导航视图：

public class ProfileFragment extends Fragment {
private ImageView avatar;
private TextView nickname, bio, website;
private FirebaseMethods mFirebaseMethods;
private Context mContext;
private AppBarLayout mAppBarLayout;
private Menu mMenu;
private RecyclerView mRecyclerView;
private FirebaseUser mCurrentUser;
private TextView followers, followings;
private BottomNavigationView mBottomNavigationView;

private String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE};
private ActivityResultContracts.RequestMultiplePermissions mRequestMultiplePermissions= new ActivityResultContracts.RequestMultiplePermissions();
private DatabaseReference mDatabaseReference;
private DatabaseReference followingRef;
private DatabaseReference followersRef;
private ReadWritePermissions mReadWritePermissions;
private IntentFilter filter = new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE);
private String mParam1;
private String mParam2;
public ProfileFragment() {
// Required empty public constructor
}
public static ProfileFragment newInstance(String param1, String param2) {
ProfileFragment fragment = new ProfileFragment();
Bundle args = new Bundle();
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_profile2, container, false);
mContext = container.getContext();
mFirebaseMethods = new FirebaseMethods(mContext);
mCurrentUser = FirebaseAuth.getInstance().getCurrentUser();
mBottomNavigationView = getActivity().findViewById(R.id.bottomNavigation);
followingRef = FirebaseDatabase.getInstance().getReference("Following");
followersRef = FirebaseDatabase.getInstance().getReference("Followers");
Toolbar toolbar = view.findViewById(R.id.toolbar);
mAppBarLayout = view.findViewById(R.id.app_bar);
mRecyclerView = view.findViewById(R.id.posts_recycler);
((AppCompatActivity)getActivity()).setSupportActionBar(toolbar);
((AppCompatActivity)getActivity()).getSupportActionBar().setDisplayShowTitleEnabled(false);
setHasOptionsMenu(true);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getActivity().finish();
}
});
loadPosts();
avatar = view.findViewById(R.id.profile_avatar);
nickname = view.findViewById(R.id.profile_nickname);
bio = view.findViewById(R.id.profile_bio);
website = view.findViewById(R.id.profile_website);
followers = view.findViewById(R.id.followers_count);
followings = view.findViewById(R.id.following_count);
setFollowingFollowers();
followers.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
FollowersFollowingsFragment fragment = new FollowersFollowingsFragment();
Bundle args = new Bundle();
args.putString("uid", mCurrentUser.getUid());
args.putString("followingsOrFollowers", "followers");
fragment.setArguments(args);
FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.frame_container,fragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
});
followings.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
FollowersFollowingsFragment fragment = new FollowersFollowingsFragment();
Bundle args = new Bundle();
args.putString("uid", mCurrentUser.getUid());
args.putString("followingsOrFollowers", "followers");
fragment.setArguments(args);
FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.frame_container,fragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
});
avatar.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
mFirebaseMethods.getUserDataProfile(avatar, nickname, bio);
return view;
}
private void loadPosts()
{
mReadWritePermissions = new ReadWritePermissions(getActivity().getLifecycle(), getActivity().getActivityResultRegistry());
getLifecycle().addObserver(mReadWritePermissions);
mCurrentUser = FirebaseAuth.getInstance().getCurrentUser();
mDatabaseReference = FirebaseDatabase.getInstance().getReference().child("Posts");
mRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
FirebaseRecyclerOptions<Posts> options
= new FirebaseRecyclerOptions.Builder<Posts>()
.setQuery(mDatabaseReference.orderByChild("uid").equalTo(mCurrentUser.getUid()), Posts.class)
.build();

mReadWritePermissions = new ReadWritePermissions(getActivity().getLifecycle(), getActivity().getActivityResultRegistry());
getLifecycle().addObserver(mReadWritePermissions);
PostAdapter adapter = new PostAdapter(options, mContext, mReadWritePermissions);
mRecyclerView.setAdapter(adapter);
adapter.startListening();
}
private void setFollowingFollowers()
{
mCurrentUser = FirebaseAuth.getInstance().getCurrentUser();
followersRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
followers.setText(Integer.toString((int)snapshot.child(mCurrentUser.getUid()).getChildrenCount()));
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
followingRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
followings.setText(Integer.toString((int)snapshot.child(mCurrentUser.getUid()).getChildrenCount()));
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
}
@Override
public void onPause() {
super.onPause();
}
@Override
public void onResume() {
super.onResume();
}
}

Answer 1

请改用setVisibility(View.GONE)。

我也遇到了同样的问题，出于某种原因，它不起作用，但在文档中，他们也使用View.GONE。

编辑：使用文档中显示的方法根据Fragment隐藏/显示BottomNavigationView。

navController.addOnDestinationChangedListener(new NavController.OnDestinationChangedListener() {
@Override
public void onDestinationChanged(@NonNull NavController controller,
@NonNull NavDestination destination, @Nullable Bundle arguments) {
if(destination.getId() == R.id.full_screen_destination) {
toolbar.setVisibility(View.GONE);
bottomNavigationView.setVisibility(View.GONE);
} else {
toolbar.setVisibility(View.VISIBLE);
bottomNavigationView.setVisibility(View.VISIBLE);
}
}
});

使用导航组件，如本例所示。

Answer 2

我通过使用DataBinding和ObservableField来提高可见性来解决这个问题，我不知道为什么它不能通过NavController上的普通onDestinationChangedListener工作，它只是直接忽略了那个命令，该块中的其他一切都很好，但可见性不好。

所以数据绑定中的ObservableField完成了的任务

android:visibility="@{hideBottomNav ? View.GONE : View.VISIBLE}"

并将onDestinationChangedListener中可观察字段的值设置为您想要的结果

if(destination.id == R.id.navigation_your_notes){
hideBottomNav.set(true)
} else hideBottomNav.set(false)